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I've heard a lot about the bug with sacrificing creatures. How does it work? (I suspect that this bug needs to be exploited on this map)
You can read about the bug in Fizmig:
There is a bug - Phoenixes can be resurrected even after being sacrificed (with the Vulnerability Medal). The resurrection does not happen immediately, but at the moment when the Phoenixes' turn comes. If another creature is on the same cell at the moment of resurrection, it becomes invisible until it moves. Enemy creatures cannot attack it. If another creature is partially on the Phoenix's cell, then there will simply be a graphical overlay.
And in which battle did you suspect that this bug might be needed?